He returned with some amazing images that he made into a book called "Odo Yakuza Tokyo." (Odo means "the way of the cherry blossom" and is the credo of the Yakuza family he followed.

In the introduction, Kusters tells the dramatic tale of how he gained such amazing access.

A smoldering cigarette was all that remained in the ashtray on the table we sat at. The family Boss had just nodded yes, then stood up and left the room with his bodyguard. My brother Malik and I had done it. After months of negotiating, we were allowed to present our project proposal to the Boss, and he had just accepted. Roughly 1,600 family members now would to be informed of our presence, to prevent “shoot first, ask questions later” type of incidents. The door to photographing the Yakuza, the largest organized crime syndicate in the world, was now open. And yes, we would be closely watched every step of the way.